Portion of a shoe midsole



FIG. 1 is a perspective view of a portion of a shoe midsole showing our new design;

FIG. 2 is a side view thereof; and,

FIG. 3 is a rear view thereof.

The broken lines showing of a shoe in FIGS. 1–3 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a portion of a shoe midsole, as shown and described. 